|
Turbo C 2.0、Borland C++库函数及用例(36) {
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} midx = getmaxx() / 2;
midy = getmaxy() / 2;/* draw arc and get coordinates */
setcolor(getmaxcolor());
arc(midx, midy, stangle, endangle, 100);
getarccoords(&arcinfo);/* convert arc information into strings */
sprintf(sstr, "*- (%d, %d)",
arcinfo.xstart, arcinfo.ystart);
sprintf(estr, "*- (%d, %d)",
arcinfo.xend, arcinfo.yend); /* output the arc information */
outtextxy(arcinfo.xstart,
arcinfo.ystart, sstr);
outtextxy(arcinfo.xend,
arcinfo.yend, estr);
/* clean up */
getch();
closegraph();
return 0;
}
函数名: getASPectratio
功 能: 返回当前图形模式的纵横比
用 法: void far getaspectratio( int far *xasp,
int far *yasp );
程序例:#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>int main(void)
{/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int xasp, yasp, midx, midy;/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");/* read result of initialization */
errorcode = graphresult();/* an error occurred */
if (errorcode != grOk)
{ printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor());/* get current aspect ratio settings */
getaspectratio(&xasp, &yasp);/* draw normal circle */
circle(midx, midy, 100);
getch();/* draw wide circle */
cleardevice();
setaspectratio(xasp/2, yasp);
circle(midx, midy, 100);
getch();/* draw narrow circle */
cleardevice();
setaspectratio(xasp, yasp/2);
circle(midx, midy, 100);/* clean up */
|
